Energizer 4.2W Dimmable LED Candle Bulb B15 - Warm White 2700K

The Energizer 4.2W LED candle bulb is a B15 small bayonet cap fitting designed as a direct replacement for 40W halogen candle bulbs. The frosted candle shape delivers 470 lumens of warm white 2700K light, and the bulb is compatible with most household dimmer switches, allowing brightness to be adjusted from full output down to a low ambient glow.

Designed for chandeliers, wall sconces, bedside table lamps and decorative fixtures with visible bulbs, the candle profile sits within traditional lampshades and exposed fittings without protruding beyond the shade ring. The B15 small bayonet cap fits UK and European light fittings that take SBC bulbs, with the two-pin bayonet twisting into place for a secure fit. The dimmable function allows the light level to be set for different times of day or activities, from full brightness for task lighting to a softer level for evening relaxation.

The LED technology draws 4.2W to produce the same light output as a 40W halogen, reducing energy consumption by approximately 89% and heat output significantly. The bulb carries an E energy rating under the 2021 EU energy label and a claimed 15-year lifespan based on average domestic use of 2.7 hours per day. The frosted finish diffuses the LED elements inside, giving a more uniform light distribution than clear candle bulbs and reducing glare when the bulb is visible in an open fitting.

Is this bulb compatible with all dimmer switches?

The bulb is designed to work with most household dimmers, but performance varies depending on the dimmer type and age. Older leading-edge dimmers may cause flickering or a restricted dimming range. For best results, use a trailing-edge dimmer rated for LED loads. If you experience flickering, the dimmer may need replacing with an LED-compatible model.

What does B15 mean?

B15 is the small bayonet cap (SBC) fitting with a 15mm diameter base. It has two pins that twist and lock into the bulb holder, common in UK and European decorative fittings, chandeliers and wall lights. This is different from B22 (the standard 22mm bayonet used in most UK ceiling lights) and from E14 or E27 Edison screw fittings.

How does 2700K compare to other colour temperatures?

2700K is warm white, producing a yellowish tone similar to traditional incandescent and halogen bulbs. It suits living rooms, bedrooms and dining areas where a cosy atmosphere is wanted. Cooler temperatures like 4000K (neutral white) or 6000K (daylight) produce a whiter, more clinical light better suited to kitchens, bathrooms and task lighting.

What is the actual replacement wattage?

This 4.2W LED replaces a 40W halogen candle bulb. Both produce approximately 470 lumens, but the LED draws significantly less power and generates much less heat, making it safer in enclosed fittings and more economical to run.